Q. Which of the following is paramagnetic with bond order 0.5?
A) $F_{2}$
B) $H_{2}^{+}$
C) $N_{2}$
D) $O_{2}^{-}$
Explanation
(b)
$H_{2}^{+} = \sigma 1s^{2}\$(According to molecular orbital theory)
Bond order = $\frac{bonding\ electrons - antibonding\ electrons}{2}$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = \frac{1}{2} = 0.5$
$H_{2}^{+}$ is paramagnetic due to the presence of one unpaired electron.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.